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Yosemite setup failure

By johnsnoad ·
Tags: Apple
I've just installed Yosemite on a new internal hard drive on an Early 2008 MacPro. The installation went well and the desktop opens with my existing user name and password but I cannot open the padlock in any of the System Preferences windows as it rejects both. The USB sockets are unrecognized. Any help will be much appreciated.

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